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authorRalf Jung <post@ralfj.de>2022-02-20 21:31:02 -0500
committerRalf Jung <post@ralfj.de>2022-02-20 21:36:15 -0500
commit1e3609b1ba6cc83a7a7897202ddfca42e5dbf0ad (patch)
tree27fce075d504ae090936f0a3e720a1453cc1157c
parent45e2c2881d11324d610815bfff097e25c412199e (diff)
downloadrust-1e3609b1ba6cc83a7a7897202ddfca42e5dbf0ad.tar.gz
rust-1e3609b1ba6cc83a7a7897202ddfca42e5dbf0ad.zip
CTFE engine: Scalar: expose size-generic to_(u)int methods
-rw-r--r--compiler/rustc_middle/src/mir/interpret/value.rs46
1 files changed, 25 insertions, 21 deletions
diff --git a/compiler/rustc_middle/src/mir/interpret/value.rs b/compiler/rustc_middle/src/mir/interpret/value.rs
index aa8730bf9cd..9bea6ccec70 100644
--- a/compiler/rustc_middle/src/mir/interpret/value.rs
+++ b/compiler/rustc_middle/src/mir/interpret/value.rs
@@ -370,78 +370,82 @@ impl<'tcx, Tag: Provenance> Scalar<Tag> {
         }
     }
 
+    /// Converts the scalar to produce an unsigned integer of the given size.
+    /// Fails if the scalar is a pointer.
     #[inline]
-    fn to_unsigned_with_bit_width(self, bits: u64) -> InterpResult<'static, u128> {
-        let sz = Size::from_bits(bits);
-        self.to_bits(sz)
+    pub fn to_uint(self, size: Size) -> InterpResult<'static, u128> {
+        self.to_bits(size)
     }
 
     /// Converts the scalar to produce a `u8`. Fails if the scalar is a pointer.
     pub fn to_u8(self) -> InterpResult<'static, u8> {
-        self.to_unsigned_with_bit_width(8).map(|v| u8::try_from(v).unwrap())
+        self.to_uint(Size::from_bits(8)).map(|v| u8::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce a `u16`. Fails if the scalar is a pointer.
     pub fn to_u16(self) -> InterpResult<'static, u16> {
-        self.to_unsigned_with_bit_width(16).map(|v| u16::try_from(v).unwrap())
+        self.to_uint(Size::from_bits(16)).map(|v| u16::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce a `u32`. Fails if the scalar is a pointer.
     pub fn to_u32(self) -> InterpResult<'static, u32> {
-        self.to_unsigned_with_bit_width(32).map(|v| u32::try_from(v).unwrap())
+        self.to_uint(Size::from_bits(32)).map(|v| u32::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce a `u64`. Fails if the scalar is a pointer.
     pub fn to_u64(self) -> InterpResult<'static, u64> {
-        self.to_unsigned_with_bit_width(64).map(|v| u64::try_from(v).unwrap())
+        self.to_uint(Size::from_bits(64)).map(|v| u64::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce a `u128`. Fails if the scalar is a pointer.
     pub fn to_u128(self) -> InterpResult<'static, u128> {
-        self.to_unsigned_with_bit_width(128)
+        self.to_uint(Size::from_bits(128))
     }
 
+    /// Converts the scalar to produce a machine-pointer-sized unsigned integer.
+    /// Fails if the scalar is a pointer.
     pub fn to_machine_usize(self, cx: &impl HasDataLayout) -> InterpResult<'static, u64> {
-        let b = self.to_bits(cx.data_layout().pointer_size)?;
+        let b = self.to_uint(cx.data_layout().pointer_size)?;
         Ok(u64::try_from(b).unwrap())
     }
 
+    /// Converts the scalar to produce a signed integer of the given size.
+    /// Fails if the scalar is a pointer.
     #[inline]
-    fn to_signed_with_bit_width(self, bits: u64) -> InterpResult<'static, i128> {
-        let sz = Size::from_bits(bits);
-        let b = self.to_bits(sz)?;
-        Ok(sz.sign_extend(b) as i128)
+    pub fn to_int(self, size: Size) -> InterpResult<'static, i128> {
+        let b = self.to_bits(size)?;
+        Ok(size.sign_extend(b) as i128)
     }
 
     /// Converts the scalar to produce an `i8`. Fails if the scalar is a pointer.
     pub fn to_i8(self) -> InterpResult<'static, i8> {
-        self.to_signed_with_bit_width(8).map(|v| i8::try_from(v).unwrap())
+        self.to_int(Size::from_bits(8)).map(|v| i8::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce an `i16`. Fails if the scalar is a pointer.
     pub fn to_i16(self) -> InterpResult<'static, i16> {
-        self.to_signed_with_bit_width(16).map(|v| i16::try_from(v).unwrap())
+        self.to_int(Size::from_bits(16)).map(|v| i16::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce an `i32`. Fails if the scalar is a pointer.
     pub fn to_i32(self) -> InterpResult<'static, i32> {
-        self.to_signed_with_bit_width(32).map(|v| i32::try_from(v).unwrap())
+        self.to_int(Size::from_bits(32)).map(|v| i32::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce an `i64`. Fails if the scalar is a pointer.
     pub fn to_i64(self) -> InterpResult<'static, i64> {
-        self.to_signed_with_bit_width(64).map(|v| i64::try_from(v).unwrap())
+        self.to_int(Size::from_bits(64)).map(|v| i64::try_from(v).unwrap())
     }
 
     /// Converts the scalar to produce an `i128`. Fails if the scalar is a pointer.
     pub fn to_i128(self) -> InterpResult<'static, i128> {
-        self.to_signed_with_bit_width(128)
+        self.to_int(Size::from_bits(128))
     }
 
+    /// Converts the scalar to produce a machine-pointer-sized signed integer.
+    /// Fails if the scalar is a pointer.
     pub fn to_machine_isize(self, cx: &impl HasDataLayout) -> InterpResult<'static, i64> {
-        let sz = cx.data_layout().pointer_size;
-        let b = self.to_bits(sz)?;
-        let b = sz.sign_extend(b) as i128;
+        let b = self.to_int(cx.data_layout().pointer_size)?;
         Ok(i64::try_from(b).unwrap())
     }